The Phase Diagram of Disordered Vortices from London Langevin Simulations

Abstract

We study the phase diagram of vortex matter in disordered type-II superconductors. We performed numerical simulations in the London Langevin approximation, using a new realistic representation of the disorder. At low magnetic fields we find a disentangled and dislocation free Bragg-glass regime. Increasing the field introduces disorder-driven entanglement in a discontinuous manner, leading to a vortex-glass phase, which subsequently melts into the vortex liquid. The obtained phase boundaries are in quantitative agreement with the experimental data.

4 pages, revtex, 8 postscript figures included

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